Asymmetric interactive buckling of thin-walled columns with initial imperfections

Marcello Pignataro (1) , Angelo Luongo (2)

1 DISG - Dipartimento di Ingegneria Strutturale e Geotecnica
2 DICEAA - Dipartimento di Ingegneria Civile, Edile-Architettura, Ambientale

In this paper the effect of the interaction between two or more simultaneous buckling modes on the postbuckling behaviour of uniformly compressed thin-walled members (TWM) is analysed by means of the general theory of elastic stability. The analysis is restricted to third-order terms of the energy expansion and therefore can be fruitfully applied to the investigation of structures with asymmetric postbuckling behaviour only. Initial imperfection effect is taken into account. A simplified procedure is suggested for solving the nonlinear equations relative to the evaluation of the bifurcated paths. By using the finite strip method an extensive parametric analysis is performed. It is found that when the flexural-torsional (FT) buckling interacts with a local symmetric and antisymmetric mode, sensitivity to initial inperfections is remarkable and is comparable to the one arising from the interaction between the Euler (E) and any local buckling.

Domaines: Génie civil

Marcello Pignataro, Angelo Luongo. Asymmetric interactive buckling of thin-walled columns with initial imperfections. Thin-Walled Structures, 1987, 5 (5), pp.365-382. ⟨hal-00789165⟩